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l limit images of greens to a scale of 3/8 inch to 5 yards (1:480), and books can be no larger than 4 1/4 inches by 7 inches (pocket-sized). The interpretation also bans the use of magnification devices beyond normal prescription glasses.

l limit images of greens to a scale of 3/8 inch to 5 yards (1:480), and books can be no larger than 4 1/4 inches by 7 inches (pocket-sized). The interpretation also bans the use of magnification devices beyond normal prescription glasses.

Bryson DeChambeau: "I think this means I can have those 10x power bifocals."

Yeah, they have books with red lines near the hole indicating straight putts to the particular hole location, indicating which sides of the hole have putts that will remain within the cup width if struck solid and straight.

Yeah, they have books with red lines near the hole indicating straight putts to the particular hole location, indicating which sides of the hole have putts that will remain within the cup width if struck solid and straight.

the one i have has the actual circle to indicate the hole location for that day....no signs of any red lines on mine

"Yours", are you on tour?? The one Johnny Miller was showing during a broadcast a few years back did.

I worked the quicken loans this summer at my local course where I caddie.

I didnt need one as I know the greens well, but the woman in charge of giving them out for the week offered them to the caddies who didnt purchase one ($150) before the event started to get feedback from us.

Now, as I'm looking at the one I got two years ago there are more defined lines on that one. The one I got this summer is more generic ie not as many lines on the greens to the one from 2017.

Although, looking at a buddies from Shinnecock there are the red lines (along with black) you're talking about.

I am OK with yardage books because they provide information that is able to be determined without special technology. If needed, the yardage can be paced off manually, with the exception of carries over water, etc. I am OK with green books that have information that the player and/or his caddie has prepared by manual observation such as, rolling balls on the green, notes from previous rounds played, Aimpoint, etc.

I do NOT, in any way, believe that green reading books prepared using technology or equipment that provides information that can not be discernable by normal human perception should be allowed. Those type books remove what I feel is a necessary skill from the game. Walking off a yardage takes no special skill, just patience. Slope enabled lasers or anemometers (wind measuring devices) are not allowed for the same reason.

Bryson DeChambeau ran into some trouble recently using a compass on the course. Then Golfweek recently broke the story that beginning January 1, 2019, green-reading books may be outlawed on tour. What should pros be allowed to use to assist their game and what should be banned? Green-reading books? Pin-placement maps? Rangefinders? Carts? Compasses? What's integral to the game and what is just a tool, like a sand wedge, a golf bag and a caddy? Can a golfer use a computer to calculate the best path to sink a putt?

Won't Change anything. Plenty of ways to still have that information available through memory or...

l limit images of greens to a scale of 3/8 inch to 5 yards (1:480), and books can be no larger than 4 1/4 inches by 7 inches (pocket-sized). The interpretation also bans the use of magnification devices beyond normal prescription glasses.

Bryson DeChambeau: "I think this means I can have those 10x power bifocals."

Yardage charts are fine and have been around for years . The green reading books take it a step too far . The skill of reading the greens is part of the game and should remain so . So therefore in my way of thinking the green books should be banned .
In fact I would ban yardage charts and let the pro’s use rangefinders .